Date: Mon, 05 Oct 2009 13:50:30 -0400 From: Jon Radel <jon@radel.com> To: Gary Kline <kline@thought.org> Cc: FreeBSD Mailing List <freebsd-questions@FreeBSD.ORG> Subject: Re: way to check an email without sending it?? Message-ID: <4ACA31E6.4050603@radel.com> In-Reply-To: <20091005173717.GA44563@thought.org> References: <20091005173717.GA44563@thought.org>
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Gary Kline wrote:
>
> Hey Guys,
^^^^ Seen as a sexist assumption by some, but some
consider gals to be guys.
>
> Is there a way I can tell that an email address, say
>
> joe@foo.com
>
> is still valid without joe knowing that I am curious? --And,
> yes, this isn't a FBSD-specific question... .
Depends heavily on how foo.com does things. Used to be, and still is
some places, easy to tell by doing a raw SMTP connection and seeing what
the receiving server did when you provided the destination address.
That makes it real easy to harvest addresses by brute force, so these
days many servers don't give you a hint unless you actually send some
mail. Some don't even give you a hint then, simply black holing the
mail if the address is incorrect.
--
--Jon Radel
jon@radel.com
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